If you're not using Soft shadows, this can help. You have to turn on the sun's soft shadow in the Skylab and in Render settings in order to get it to work. The suggestions above are also very good and I have used them all at one time or another. Good Luck!

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy